Grinding or crushing mill.



FRANK H. BROWN & FRED H. BROWN. GRINDING 011 GRUSHING MILL.

APPLICATION FILED DEC. 8, 1909.

1,008,946, Patented Nov. 14, 1911.

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UNTTED STATES FRANK I-I. BROWN AND FRED H.

BROWN, OF PORTLAND, OREGON.

GRINDING OR CRUSI-IING MILL.

Specification of Letters Patent.

Patented Nov. 14, 1911.

Application filed December 8 1909. Serial No. 532,100.

To all whom it may concern:

Be it known that we, FRANK H, BROWN and FRED H. BROWN, citizens of the United States, residing at Portland, in the county of Multnomah andState of Oregon, have invented new and useful Improvements in Grinding or Crushing Mills, of which the following is a specification.

' This invention relates to grinding or crushing mills particularly adapted for the preparation of granular or comminuted cereals ordinarily used for foods; and the main object of the invention is to provide a mill wherein the grinding or crushing operation is eifected with a comparatively small consumption of power through the medium of friction set up between the main grinding wheel and a driving wheel therefor, the formation of flour being minimized with material advantages in the preparation of comminuted foods.

The invention consists in the preferred embodiment as will be more fully hereinafter described and. claimed.

In the drawing: Figure 1 is a side elevation of a grinding or crushing mill embodying the features of the invention. Fig. '2 is a sectional plan thereof. I

The present invention constitutes an improvement on that disclosed in application Serial Number 449,282, filed August 19, 1908, grinding or crushing mills, and allowed November 1, 1909.

The base 2 of the mill, having uprights by longitudinal supports 5 constitutes the frame of the machine, which is similar in all respects to that disclosed in the aforesaid application and has a receptacle 6 therein for receiving the crushed or comminuted food and provided with a suitable opening covered by a slide 7. Mounted on each of the supports 5 is a block 8 provided with a bearing 9, the said blocks being included in a super-structure and connected to uprights 10 having on their upper ends longitudinally extending supporting mem-, bers 11, each pair of uprights 10 having a single supporting member 11.

The forward ends of the supports 5 have bearings 12 thereon for a drive shaft 13 carrying on one end a drive pulley 14 adapted to be belted up to a suitable motive means (not shown), and on the opposite end of said drive shaft is a transmitting pulley 20 for a purpose which will be presently ex- 3 and 4 connected at their upper extremities plained. Fixed on the shaft 13 is a frictional drive wheel 15 having opposite conical faces or of a double gun construction to fit in and snugly bear against the walls of a V-shaped peripheral recess 16 centrally formed in a grinding wheel 17, the latter having opposite conical faces 18 and fixed to a shaft l9.freely rotating in the bearings 9. The bearings 12 are adjustable through the medium of a suitable screw means 20 cooperating with sliding plates 21 which are adapted to be fixed after adjustment through the medium of suitable set bolts 22. The adjusting screws 20 engage collars 23 fixed on the supports 5 and also have set nuts 24 thereon for obvious purposes. At the rear ofthe grinding mill conical rollers 25 are held in frictional contact with the opposite conical faces 18 of the grinding wheel 17 the grinding rollers 25 being rotated inwardly by the said grinding wheel and having at their forward reduced ends individual adjusting means 26 including springs 27, and at their rear enlarged extremities are provided with adjusting means 28 including springs 29 for unitedly adjusting the rollers at their rear ends, the individual and united adjusting means being also similar to that disclosed in the aforesaid application. I

At a suitable elevation over the grinding rollers 25 and grinding wheel 17 a feed hopper 30 is disposed and so arranged as to supply material to both rollers at the points of contact of the latter wit-h the grinding wheel. From the transmitting pulley 2O a belt 31 runs rearwardly and engages a pulley 32 on a shaft 33 for operating the mechanism of the feed hopper. The lower portion of the belt 31 engages an idler 34 held by an adjustable hanger 35 for maintaining the proper tension of the belt. For cleaning the faces 18 of the grinding wheel, suitable adjustable brushes 36 are used, as clearly illustrated by Fig. 2.

The operation of the improved grinding mill will be readily understood.

The material supplied from the hopper 30 falls to points adjacent to the engagement of the rollers 25 with the grinding wheel and is drawn inwardly between the rollers and the grinding wheel and after it is crushed falls into the receptacle 6 from which it may be moved. The grinding wheel 17 is given a continuous and regular rotation through the medium of the friction wheel 15 engaging the peripheral recess or groove 16, the frictional wheel 15 being adjusted in its preliminary application and at other times when necessary to maintain a practical frictional engagement with the walls of the said recess or groove 16. It is obvious that the friction wheel 15 may be likewise adjusted to compensate for wear. The advantage of this frictional drive for the grinding wheel in view of the structure disclosed by the aforesaid application is that it is more economical from a standpoint of manufacture as it is unnecessary to cut or otherwise regularly form gear teeth on the grinding and driving wheels. The shape of the driving wheel 15 and of the recess or groove 16 in the grinding Wheel is also important in view of the fact that a positive engagement is always maintained between the driving wheel and the walls of the groove or recess 16 without. liability of one part slipping on the other, and, further, through the medium of the arrangement of the frictional driving means and the shape of the driving wheel and groove a reliable and regular rotation is given the grinding wheel from the periphery of the latter with the further advantage that wear on the bearing 9 and shaft 19 is materially reduced. The groove or recess 16 in the grinding wheel 17 may be produced in any suitable manner, and the position thereof between the grinding faces 18 does not in the least interfere with the grinding operation.

It will also be understood that the feed for effecting a proper distribution orsupply of the material to be ground relatively to the rollers 25 and grinding wheel 17 though it has been found that the devices for this purpose disclosed in the aforesaid application are practically effective.

What is claimed is:

A mill of the class described embodying a grinding wheel of large diameter having reversely inclined sides equally sloping from the center convergingly toward the periphery of the wheel, the periphery of the wheel having a central V-shaped groove extending fully throughout the circumference thereof, the side walls of the groove intersecting the outer terminals of the said reversely inclined sides, a shaft centrally disposed in the Wheel to rotate therewith and having suitable bearings, a frictional driving wheel having inclined faces converging toward the periphery thereof and snugly engaging the central peripheral groove of the grinding wheel, the frictional driving wheel engaging the grinding wheel below the plane of the shaft of said grinding wheel, and conical grinding or crushing rolls held in yielding engagement with the two inclined sides of the wheel and disposed in approximate alinement with the shaft of the grinding wheel.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

FRANK H. BROWN. FRED H. BROWN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. c 

